Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7e4b1d0884c80edaf3e6dac26f12c6bb366ac7b4f920becb1db8ecbdee0bcf' 
  AND token = 'xdusf7RTR1aWfVLlWatKV3bnSTLbS2cvEaeTV0ohSn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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