Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aad012e170f75f7a1978399fff251e871ec32964688cfffe51c2e858bedcbcd6' 
  AND token = 'QLmCE/y9H6ssMugCsepPvHFpMh1KzLo8LFi/2PYwAiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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