Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77907955eb6e46db42dfb5cebc8c9390f8ec3cbc7c1a0da39f07ad0b1043aa55' 
  AND token = 'K4KkuqXibDpMWqqPr0WOc9FWtY5Pw7Y3XnSvBLP+sx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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