Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7943d3dcdd9417151d6260646b116ea15ac7594ece3bdab506450b6884068c3' 
  AND token = 'yHfSktt6SuoKJy5S2ABMx9We34Q+GYQUjucHiY8bY78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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