SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f3c00817dd413555a58026ccb06c3c6407a4546d17d3487fadf010fe377354a0' 
  AND token = 'ppJ5RYGJUTPKnrznSgnPq0+hXYK42uVnhqMX+QQ9IBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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