Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e414ff2164290a55ad3e9b60623fc1f2e5929c1d5e706bbc3c06e056ce1e2fb' 
  AND token = 'VTR0rKx2Sv47iUIwatZrDEXmKIPkHIfu0kB3KGXjrHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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