Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec96e7125938c55beb5397c2da732f233cdcea36724bd44f023ca6ffcc85aa4' 
  AND token = 'bUyFf8EEqYFX9WeMxvCb0tAtum2wbDv//djGls27xpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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