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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f3bb97334a6f837925861855991e538bf891e5cb2d33c617e39f5a5c50ee7b4' 
  AND token = 'cXaUtrAZ6V2tNxWVX7+Mdeg0Dh+uQ6d+SgKORkk33CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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