Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a8d4d19597c9246e7aa7e9e8c43aff38d24b63e6f880a33b89975da2d419bc' 
  AND token = '8pJA+1r3QIhblTZon0uiocyFlzxYj+P4nI2gDbWmPXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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