Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a644d59d61ffe260995cd17fd818a7b5689c1dee2b4e46303e98daed2950b679' 
  AND token = 'koVevPbub8KSlKn2E0oicaFxLIKLIy3eXzqb0etVCko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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