Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfa0bfe78d37109468112b9532cdc0ab93eedb14b660b25b055041bbbf2199a' 
  AND token = '1lvY0X+QCoDDwZ64Vd0QErzOwpHwi7w2MRX2H8cXFfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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