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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a21afe8dec7bcf3fea8360ffa0777567596f8949292f10920f84ce8232d2357' 
  AND token = '0FpEi8XSeM0dXOfD3v2jC/GSgE0Y2x2Q/i4EakKlVAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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