Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3bfe26fcbcad3f8bc8f776e2d267693fb497150448ce08c365a9ef2261b790' 
  AND token = 'TAt4yRYasDSFBun9+gOreOsfHHorcy376K3jpCumgj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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