SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2cebe7d9c3c7fef3f11c65c77b97d3dca2088f1bc88da585ab509762108ae231' 
  AND token = 'wS2OoDDBvX7GqiaXEFMVZJZB/B9zzVmpVVGxANjA1JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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