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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9dd0a1b592ebe544e8696d64c7f6b2ea71e77e29df3f49d57018a9c824c75f53' 
  AND token = '1eriw415Hb2+emf01VcNzenlZFpdajbYOfGsn+uee+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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