Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b58b0272f63b76ac785a2d4721c0285d1a1add34be856ccf9b3ea987e6a875' 
  AND token = 'LpZHAlBFhS5jxFjFlYbLiHat7V09AS7doB4l/rXF0iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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