Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c3c21c2b412896f9566d940d77f609ef965de9ac208a77769b1952dc77d680' 
  AND token = 'TBxwpI+O5xa+3Npliz9rvRzUdmRyEAzUmfcPUv9o4vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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