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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '093931bb57ac34cf260f91c0905def89de9c1e80be508da310a9a59963ee82ea' 
  AND token = 'LW63y580HTWeHq802Gt1L1tFxCdCUVtSWzCdfzOgmWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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