Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bea13a3edeb76c7f2334b71a761befe9703d2064d5a442f9fe7f81ab053fe1' 
  AND token = 'kYmO06rBEcNrzCgYM9fhqSahT6aNMCVpRdzKBt1+Mn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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