Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b291d21db1d296f47baae516d1e96a1117566eef35340588a71bfdc2fe471d4d' 
  AND token = '7dkBGURD/Dt4RZh3VcZQoxVS6rohQICimCUSGuYXbSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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