Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1bcfe8da4d56b6f4514212f4cb90cb1f0d25544fb1e67947f31ef5772136c5' 
  AND token = 'ZM71/VaRurxvU+hY7W06Ceh4Tr0hDQxQpTkdIda7tVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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