SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f80d97d3d6409dfbf534f55d8fb2eb2fd2f373d9c0fef481483928372e94570c' 
  AND token = 'qdoE5g7fvlhrbOut2mY1+wRkKI6f/4hK78pkDyttRVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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