Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54e5bdda1ae52595af88a7e01b312c9fd977cb6c7a1a0a5b91bc7df12d263c9' 
  AND token = 'YbIgqP3vtImfajb/R+ScM4oNiQTtkOnKdfhfiibNUtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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