Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608c03df38c8616ab4130995f3de7a25bae20e4ae93ccbfdf77f35476c4aab28' 
  AND token = 'TWissozkwHH5IKU8awEXfSDIt2s4yqhl0V+XVXnS/RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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