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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '10df31c5a69672815e82fd3464ddbe900f8d71b216c9f7d59a9810b7d55bbb01' 
  AND token = 'iWTX+mdq1ySWCapy9C9++1KwIVrTh5ZQGCejMEVyd1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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