SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '240596a971156bcc8cb8a8fabbfd4ad945b981592fc2fc25387d9f44dd97f578' 
  AND token = 'gu3SFYU8gilpmDjq5n4M4gdRlHJzI9h/kvzg8KRz0Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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