SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '674457f05e3a4795b2bf7b0c45b28a9440756e9fa419064fdf51d025052ce6f7' 
  AND token = '74zaJJzOU8F9VLVgA4Zg6S/TrmHdjv0zd13HH1c2s7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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