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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '67bf444cecf30a5b1c86ee28f57be048bd6ea7a912aa105ff12047c375ae0e25' 
  AND token = 'T9S4DqqFQpcnez8n5ddYPggzaL6/Q+JEn2RP0ZiDsxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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