Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c871657ed0ac80d89268bc42fe074dc3a9b112ae3afe37bfd6b7e74681588686' 
  AND token = 'Jw2cV8NZXQbNVmvAdh7/fBfv3tSBNK0avG9wFRKiKL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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