Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006af6c7fdc39df2a37568b8b9c17598f8674dc343e49b9f6e56ea7bf91da37f' 
  AND token = 'Mr3//0aeoadDV8ryKfyKZ8LUY+dDvyOHJ+2zb0Nbhgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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