Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6a22caab46ee414ff790d48c8f36f38e11ab79db5d1d0bd8c218fc9e320d38' 
  AND token = 'k7vUPEdujt35OoqIFgtxnBJUUZiNAZRHRqr5KtwgF60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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