Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1205b3cab9c31fba3709b5731809abdd9744442519e8af8fc7f082a28f4ce67' 
  AND token = 'B5nAfyRy6lZiLaJQ1uoJheW8M3paKLZXTSXzTC0lIP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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