SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '177441897fe830ea43584b0ff568c41f8ffe390f6fe891646c0a68c37fb71536' 
  AND token = 'eOPmdgJjsh8ZkonG6WRoMFHOqTBmQHKW1z4M9/j5Wz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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