Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d7f6751b956c92b630243e6b8ad0a38e2b219bdef8ee1ee05f4fd2fb9ed101' 
  AND token = 'SK3f6tiIDf2SbY1Vuy7hYZwuFEmvx4P1JXD2YVz2iaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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