Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f604370aba3bc519386e3b1f75d5fdaf41813eaab78de8e4c76895eba9dab5' 
  AND token = 'Zrlhtkh/tsmuKmwaxxrWCyCgsCnZ9lmv64yneZ6CfLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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