Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e907ec0cdbfeba68a6c00bde2e83005ae210da8e2c67042f3b2c9e6307a2ff' 
  AND token = 'gcpSK8aHYthCQVMgrl6IORVm8rcI0vmpTFBYPuZh2xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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