Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8327ee003d363977fa38efbbae1898cc5e25ceb7075d6bab537aeaeb7c4d856' 
  AND token = '6CnUd8UPf9YSfxfIj7vD5ecB0tZscZuLfcJc54Pvn1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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