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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d9116c790f3800e478bd5148511b04502f7e84748aa549055deccafb9f569a4' 
  AND token = 'prGRUNGcTiVncLmxzG3i4w2eXV86Db4qbFhl2YY4X20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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