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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '991b7487d7180877d89d3f69a9473bae8f090639671746bedf1fab5d7eb25eff' 
  AND token = 'U4+t8LBteH+jY7M0O2oqiUh4QfvX5bQAqVXyfZyU8xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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