Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4bbba76031febadd0dce8591369c8176b249b166392aa83538e93d586ec8c5' 
  AND token = 'KsLCNcXQsminKy8rmI80GhRO/LRuGTe1mVMQIrG2WR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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