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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93f1860c4d376824947b9afdf2f4577c1a1c7d089e1b57a7db32c95ff64e0a35' 
  AND token = 'OW4vziGJO9NSyp82pCVC87VxvhuSdP8YzmGpDz9Jy7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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