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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '26da455ce1610018618dc33b13995b44e4e5db122bead5b353e6ed20061fb416' 
  AND token = '6ftjZszMRF7WRg0AHdgQxQ+m1DOk0sv1LIXhAdh5h7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}