SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb74fb09f79eb3813be829d3d41a7e5bf2b35b24f5a1c640e2e7bc6c3312090b' 
  AND token = 'x9gJYJ0J+tgvLSBhT9F6cpkFMDegUNgF3HYulXKKWfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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