Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee5c3235c1dd73918d1acc45492168a46a7e5ffee0708b15d5ea81fc0784e55b' 
  AND token = 'mQrezRKgCPMsIXp75RTLlmol6nntxBbqlW0r6qdh6Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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