Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b9c0d615bab8f748c1e780139fbf99c1cb413dc21fc3127c98128f35dfa103' 
  AND token = 'BvCZ0y6TsVXCTLi6xlH/qDFKWrdKNSuVkcrJqg3cHfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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