Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7437951bd4bd1cecda8c521e393f2d661e5723009fb4dde1b0b877c69d0975' 
  AND token = 'tMa3lbDmxL/Q/4Ruq9ACIpKtMtxR5li5JBDD+OG/KXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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