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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'adb59bd4e2f285dffa51d586c5494a00fc51398819399c6d039b71c66f5966a3' 
  AND token = '9bQ/NPhtQJ+1Yf/vtClJo5lt8PC7xLboC/ktcPDO8c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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