Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6d9c7a3e1318e4aba7e4879c213948f2eaa92f778105c9b8e3d1feb4790e1b' 
  AND token = 'cVZV2UVbWTsNnrhIQI2qxLGaCnWMy7vWLyoNRbrp1SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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