Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb088479924667644abde1ff2d0b778fb0f29f253b7eacc4aa00ba47e1b8669' 
  AND token = 'aYixaXqMYp/pTpBlgTu2djIp2BE2uPnd5aL6Duq+8Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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