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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd94e1c1693a81fffa71663abba0d79b1a5614e232051ec1cc951c395467421f4' 
  AND token = '4V60gTMY6K2o7oT5+032mrZ/TAl53cHES+ca7RmbI0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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