Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb375945350ce78df5df16c3f6f5e83ab30e6c81bb27d5f93d58052ffb40668' 
  AND token = 'bUljgJQU0EGCNOsEVarQ59t6IvvkRNT3vYM27U+GtZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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