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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '468d9ba2c4345be1abb73d8a24cc1651c2efc70ef04c849aa1c858f30e048419' 
  AND token = '04sE9qsu0gdIP0+gZ/vYU7kRXyKOmRkRFk0YG4ojnBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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