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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f939db0c0a4943c3b3b8fcd1fed3882fd36b579f350b52e645fdb0a134aef9e1' 
  AND token = 'wRMCALf7vv+erHaWB914YZW1wYNSp4ipx5TsBzVokxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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