Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d5972b6d0b75dc604e7ef0226a29808219c993b68afc0e96e07251f1d7dcf3' 
  AND token = 'd5ih8kLUB+T8xtj22FHndwwu5o3uX2CZTgzo98dwDRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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