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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5e10fadc91905c4ea91fcd9dda22736522a610db9181758b5ea3e83ea21a513d' 
  AND token = 'cwu/OxSadkNrpVn36KuElpwqhkvOkQ0BBFFs7xTi99w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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