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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01511beec859b12cf8e0e8502bcc2b50a3d5c3894d413017a89e47e7cb846354' 
  AND token = 'TGrjOjHCnn5jd6Els7PhkSYCfNcgrP4BuI8DwiqowAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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