Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b8740845bffd53666a73525a6329c7a4fb43862cd3edbba47a50cf4b778a60' 
  AND token = 'Y4gD7KpDQ4eJTfFC/TTh0ezJyBmAH+oDXA/Zz3CaS8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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