Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d7251c8c42cc3584d831395532a366ce57572edc26bc8d9c3c12f06602ad3b' 
  AND token = 'EFBi7qBSiyMj3RhwefOelFXjRnmttQG5IP+qySlyHbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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