Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa6086f0adf5a1b0183d4ebd3e52cf386d2ec2f263fb43c082cb287706d118f' 
  AND token = 'Wiv/dvbTtGxZH39Q3jYK/bMMl6CEATmsEdQhe/87NkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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