Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfc2b52973cd3da298a6a443f357e29c1dfe71430d3d9970adef330f001225b' 
  AND token = '/x0K1aaiebawBh1VIpBwD1vp4vzwP+6bOJFe1GhoCAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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