Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff43b82caab241a4e8e24863e79ee35326321afbc81009bcb7941a99687b0153' 
  AND token = '3f8h6d0iaMommKF1ANDZhPH4YN9w7lNaJNaV9e+a6OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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