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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c5be8fc489775dae79b2abeb065e4795292ccf9b67c8dcc762653d10c558c86b' 
  AND token = 'EKOxyPGAb/Z+xggHkrwk1A7ydmxqKi80zn5VWTAKkFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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