Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f83ba74806ee82924b6e94009ec3ab4b10757eb92a2fdfaa55c7f6b6fb6ea3' 
  AND token = 'X4kfAnWZAiGvlkhVvK45oQvA4NMzI1U1ZcfvkvkW5w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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