Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9378db5ad529ccf42c5335358aec6f5e332e05d35dc9bcac5da1e721ee5a84a' 
  AND token = 'qgvOEqMb7rODaMISmU/IPldljN786kEJ4+QD7tOItvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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