Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb4e72bb3b9b5ba4d7bb42461d86d479023a80cabe1ee69e711d6de1da2e5f6' 
  AND token = '9EzM1jBFMDH/gcZIbHQH4QL7IfAV0jzv+0KFF3/z/Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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