Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e04fca11e3e3460889957a1074917d3a11e768a75a32f693a0ef6402f5211f' 
  AND token = 'nn6KIQYKqlBflmuyhi0kcRugvpe71XpinjTpQkptIUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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