Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e693fa532251ffb9cbe234f8c9f4b0b2aba5365a506aa31bd0fe8102f970c3a' 
  AND token = 'kxQ4WGVoLGyKROQEhfon1wHoBVWEHDHCG3Uyea0Z+Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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